QuickBooks event log error 4 generally indicates there was an error while running QuickBooks Integration Manager. You can follow the steps below to resolve error 4 in QuickBooks: • Open the Run box type “appwiz.cpl” to open Add/Remove programs. • Locate Microsoft .NET Framework 4.0 and click ‘Uninstall.’ • Restart your PC and open the Add/Remove programs option once again. • Click on Add Remove Windows Features and expand .NET Framework • Open Microsoft .NET 3.5 and check the first and second option. • Install the .NET Framework 3.5. and follow the regular steps to complete the integration process. If you have any trouble completing the steps mentioned above, you can contact quickbooks for support and ask for additional technical assistance.